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A neighbour of mine shaved her Samoyed one June. She was not being careless; she was being kind. The dog was panting on the patio, there was white fluff drifting across the lawn like dandelion seed, and shaving seemed like the obvious mercy. Three days later the dog had a sunburn across her back, and by the following spring the coat had grown back in patchy grey tufts that never lay flat again. That is the short version of why shaving a double-coated dog is usually the wrong call, and it is worth understanding the longer version before you buy the clippers.
A double coat is two separate things doing two separate jobs. Underneath there is a dense, woolly undercoat that traps air. On top there is a layer of longer, coarser guard hairs that shed water, block ultraviolet light and keep debris off the skin. The undercoat is what blows out in clumps twice a year. The guard coat is slower-growing and, in many breeds, does not reliably return once it has been cut. Huskies, Malamutes, Samoyeds, Golden Retrievers, German Shepherds, Border Collies, Corgis, Chow Chows, Australian Shepherds and Pomeranians all carry this arrangement in one form or another.
Here is the part that surprises people. That trapped layer of air is insulation, and insulation works in both directions. It slows heat moving out of the dog in winter, and it slows heat moving into the dog in summer. Strip it off and you have not opened a vent, you have removed the loft insulation from the roof in a heatwave. The dog's skin now sits directly under the sun with nothing between it and the radiant heat coming off a paving slab.
The other thing worth knowing is that dogs do not cool themselves through their skin the way we do. They have almost no functional sweat glands over the body. Cooling happens by panting, by evaporation from the tongue and airway, and to a small degree through the paw pads and belly. Shortening the coat does close to nothing for that mechanism. The dog still pants at the same rate; it just does it with an exposed back.
Sunburn is the immediate risk, and it is not theoretical. Pale-skinned dogs, thin-coated dogs and any dog clipped down to stubble can burn within a single afternoon. Repeated sun damage to unprotected skin raises the risk of skin tumours later on, which is a slow and expensive way to regret a haircut.
Then there is the coat itself. Groomers call the aftermath post-clipping alopecia, or coat funk. The undercoat, being soft and fast-growing, comes back quickly and thickly. The guard hairs come back slowly, unevenly, or in some individuals not at all. What you are left with is a dog covered in dense fuzz with no protective topcoat, which sheds worse than before, mats more easily, holds water when it rains and no longer regulates temperature properly. It is more common in the Nordic breeds than in retrievers, but no groomer can tell you in advance which dogs will be affected. Once it happens there is no reliable fix; you wait, and sometimes it simply stays that way.
There are legitimate exceptions, and they all involve a vet or a genuine welfare problem. A coat so severely matted that brushing would be cruel has to come off, because pelted fur pulls at the skin and hides sores underneath. Surgical sites need clipping. Some dogs with skin disease need the coat reduced so medication can reach the skin. Very old or incontinent dogs sometimes need sanitary areas kept short for hygiene. Those are medical decisions, not comfort decisions, and the coat damage is an accepted cost.
The real answer is to remove the dead undercoat while leaving the guard coat intact. That is the whole trick. A coat full of shed, compacted fluff is a heat trap. A properly cleared coat, with the same length on top, lets air move against the skin and lets the dog do what it evolved to do.
Get an undercoat rake and a slicker brush. The rake, with its row of rotating teeth, pulls loose wool up and out without cutting the topcoat. Work in sections, going with the lie of the hair, and pay attention to the places that pack down hardest: behind the ears, the trousers on the back legs, the ruff around the neck, the armpits and the base of the tail. Ten focused minutes three or four times a week during a shedding cycle removes an astonishing amount. If you have never done it properly, expect to fill a carrier bag from one big dog.
A bath and a proper blow-out is the professional shortcut. Groomers use a high-velocity dryer that blasts loose undercoat out in sheets. Booking a deshedding treatment at the start of summer will do more for your dog's comfort in one afternoon than any clipper ever will, and the coat stays intact. Ask specifically for a bath, blow-out and rake, and say clearly that you do not want the dog clipped.
Then manage the environment, because that is where the real cooling happens. Walk early in the morning and late in the evening, and use the back of your hand on the pavement for seven seconds; if you cannot hold it there, it is too hot for paws. Provide deep shade rather than a kennel, which becomes an oven. A paddling pool of shallow water for a dog that enjoys it works better than anything you can do to the coat, because wetting the belly, the inside of the thighs and the paws cools blood close to the surface. A wet towel laid on the floor for the dog to lie on is fine; a wet towel draped over the back of a thick-coated dog is not, because it traps heat against the body. Keep water available in more than one place, and if you are out, carry it.
Know the warning signs and act fast. Frantic panting that does not slow with rest, thick ropey drool, bright red gums, staggering, vomiting or collapse mean heatstroke, and heatstroke kills dogs quickly. Move the dog into shade, pour cool water over it, aim a fan at it and get to a veterinary surgery immediately. Do not wait to see if it improves, and do not use ice water, which constricts surface blood vessels.
The instinct behind shaving is a good one. You are looking at a panting dog wearing what appears to be a fur coat in August and wanting to help. But the coat is not the problem. Dead undercoat, hot pavement and midday sun are the problem, and all three are fixable without ever picking up a set of clippers.